3 ms·
Depends on your definition I suppose. A CRT screen would qualify according to some definitions.
by contravariant 3y ago
Depends on your definition I suppose. A CRT screen would qualify according to some definitions.
- neltnerb 3y agoThe vacuum tube alone probably qualifies according to most definitions, it's a beam of charged particles accelerated through the control grid and an accelerator voltage. Honestly not sure what else I'd call that. Nowadays what would be the closest common thing... hand held XPS exists for sure, but that's not super common (photoelectric effect that uses x-rays coming in). Can we go with an arc welder or plasma cutter if we use a definition that just means "charged particles going through an accelerating voltage in free space"?